Malicious PDF — malware analysis report

Static analysis result for SHA-256 b806ff63fd70beaa…

MALICIOUS

PDF

105.8 KB Created: 2021-06-07 01:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: feaf8576ef44bf3cfa9f665089a9b02f SHA-1: de7827a063275097c6d2b1c153a6a24074a84e37 SHA-256: b806ff63fd70beaa67ce087f0ff4cd22dc90d22894e5b0cefb54b5f068e9a94f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crewmak.ru/pbw?utm_term=emra+antibiotic+guide+19th+edition+pdf PDF link annotation
    • https://xavabakonoliwif.weebly.com/uploads/1/3/4/4/134477423/91b49a38346.pdfIn PDF document text
    • https://kilukawat.weebly.com/uploads/1/3/4/0/134017116/4ec2fa11f0af114.pdfIn PDF document text
    • https://benarejara.weebly.com/uploads/1/3/1/4/131407695/vumuredurofezejomu.pdfIn PDF document text
    • https://dexanobibe.weebly.com/uploads/1/3/5/2/135299911/fafixozikamaxejekone.pdfIn PDF document text
    • https://nolutoxut.weebly.com/uploads/1/3/4/6/134683805/farodikiratoliv.pdfIn PDF document text
    • https://wiwamimojuwat.weebly.com/uploads/1/3/0/8/130813692/renaxokege.pdfIn PDF document text
    • https://noxubesepa.weebly.com/uploads/1/3/7/4/137499292/5262490.pdfIn PDF document text
    • https://pubokimaxo.weebly.com/uploads/1/3/4/7/134710154/komorepedobe-jalivafufosetuk.pdfIn PDF document text
    • https://xeravatiwawu.weebly.com/uploads/1/3/4/6/134603636/7387675.pdfIn PDF document text
    • https://xakexoxos.weebly.com/uploads/1/3/4/3/134307698/zefofuwuvajazosotev.pdfIn PDF document text
    • https://latebutaweba.weebly.com/uploads/1/3/4/3/134315799/bopozo_mibeda.pdfIn PDF document text
    • https://xuxixoxeniti.weebly.com/uploads/1/3/4/5/134585484/0277009a1a1e1.pdfIn PDF document text
    • https://viwejabaru.weebly.com/uploads/1/3/4/7/134749074/3035a871ab.pdfIn PDF document text
    • https://xagajanum.weebly.com/uploads/1/3/4/5/134599721/mirifaburan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/44718c31-a172-4664-96e2-92a46458f55e/kidep.pdfIn PDF document text
    • http://wotasaful.pbworks.com/f/levantando_la_cortina_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2ceb4fd-740d-4ad8-a617-8400b2bcbfed/cuisinart_coffee_maker_k_cup_cleaning.pdfIn PDF document text
    • http://rajejor.pbworks.com/w/file/fetch/144750750/ion_profile_lp_turntable_software_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b53b9ac7-e5de-4ccd-9149-8dbaefb00993/jugavozexafiba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c699f99f-4276-49cb-b5c3-cbdbd6eda300/what_was_socrates_message_in_the_apology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4b45619-36ee-4987-81ad-4bfeb96bc3be/how_to_keep_your_dog_safe_from_being_stolen.pdfIn PDF document text
    • http://pazimonofe.pbworks.com/f/77002648872.pdfIn PDF document text
    • http://pejokawigar.pbworks.com/f/xadilemifafivukulisonupir.pdfIn PDF document text
    • http://zekodunu.pbworks.com/f/jazz_christmas_music_piano.pdfIn PDF document text
    • http://degenazi.pbworks.com/w/file/fetch/144457173/how_to_reset_wiz_bulbs.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13322 5664 bytes
SHA-256: 42400f8b39681580b78222ddcfe9cbf5aa52156dbabd067416231e0424e27d9a
font_01_sfnt_off0001462f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1462F 5384 bytes
SHA-256: 98eacec1d2d2358a494b90e2eea1e10e50c0dc49f48b3238e8d14ed15615f02f
font_02_sfnt_off000158e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158E6 11692 bytes
SHA-256: a566f8f59e49651030e449ab3e13ef0613e5fe7b698137b6868b3b57a244b265
font_03_sfnt_off000180fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180FB 17016 bytes
SHA-256: 46a0a7ac4ad6ea10694dc16e33bc55352a63de10adfe1cc55c871f00955bcdae